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Before the water change earlier, everything was at recommended levels. Except for my ammonia was a wee but high. Did the water change, ammonia is at about .6 and my ph is a little too acidic, what can I do to bring those down?

Do not mess with the PH. What are the ammonia, nitrite and ph of your tap water after it has been sitting in a cup for a day? Test strips are highly inaccurate and has a high chance of showing levels much lower than they really are. Ammonia should be less than 0ppm, nitrites should be 0ppm and nitrates should be greater than 5ppm for acceptable or fine water parameters. Find a pet store that uses a liquid test kit to give you numbers if you cannot afford to buy a liquid test kit.

Get a water conditoner like Seachem Prime or Kordon Amquel that will neutralize ammonia for 24 hours. Start doing 50% water changes everyday until you can get a liquid test kit. When adding water coditioner dose for the total volume of the aquarium.

We've got a water testing kit on order, every place anywhere halfway close to us has been out. We have been doing one or two almost 50% water changes a day and the water is now pristine and the catfish is starting to act somewhat normal again. We also added another filter which has definitely helped.

I feel like his behavior was caused by the medicine we were using to treat ick on two of the silver dollars, it said it was catfish safe, but I still think that's what it was.

All ick is cleared and been gone now, and we had a little fin rot too, everyone's fins are fine now except for catfish. Any trick to getting theirs better or just more of the same treatment? We're using Prime with aloe.

Check the water parameters like everyone says. Redtail catfish they prefer to eat at night. I had some of them in the past that grow almost 2 1/2 feet. When I first got them they were 1inch. At first they don't eat when the light are on. You can turn off the light to see if this help. What type of food do u give them?

The OP was misleading. You mentioned that every other fish was fine and there were no disturbances, etc. Fin rot + ich = a big disturbance and signs that fish are not fine. It's also a sign that your water isn't healthy. One of the first things you should do, once you notice a sick or dead fish, is test your water parameters. Unhealthy water will lead and often leads to unhealthy fish. It compromises their immune system.

As for your redtail cat, who seemed to have been healthy and now apparently has fin rot, here's something to note:

Originally Posted by PlanetCatfish

The important fact in feeding these fish isn't what it's when. Red tails should only be fed sporadically. Once fed they become sluggish and so the time to feed a red tail can be gauged by the activity of the fish. It will become permanently active when hungry. Over-feeding can be disastrous and is a common cause of death in these fish. In the wild the fish eat fallen fruit, crustaceans and fish.

Another update! We had our water liquid tested yesterday. And our water is great! Everything tested where it should and our water is crystal clear. We also noticed Pluto, (the redtail) was a little active yesterday so we turned off the light just to see what he would do and he instantly started swimming around. He even ate some too! :) first time in almost a week! :)

But, whenever the lights are on, he goes back to this one spot and stays completely still, doesn't even swim. Last night he was active again, but this morning he's back to sitting still. Is he just fully nocturnal now? I know a lot of cats can be, but he wasn't like this at all when we first got him.

Just so glad he's finally eaten and our water is back to normal again.everyone is healthy again. :)

Once he get used to the routing of on/off light, feeding time and everything he will be active. Because he is nocturnal he will be more active during night than the morning. I suggest that you feed your fish 2 times a day. 1 at the morning and then at night, this way if he don't eat first he will eat at night. And glad he is much better.